84431985 has 32 divisors (see below), whose sum is σ = 148625280. Its totient is φ = 40927040.

The previous prime is 84431983. The next prime is 84432017. The reversal of 84431985 is 58913448.

It is not a de Polignac number, because 84431985 - 2¹ = 84431983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84431981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17851 + ... + 22079.

It is an arithmetic number, because the mean of its divisors is an integer number (4644540).

Almost surely, 2^84431985 is an apocalyptic number.

It is an amenable number.

84431985 is a deficient number, since it is larger than the sum of its proper divisors (64193295).

84431985 is a wasteful number, since it uses less digits than its factorization.

84431985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270 (or 4248 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 84431985 is about 9188.6878823910. The cubic root of 84431985 is about 438.7013793413.

The spelling of 84431985 in words is "eighty-four million, four hundred thirty-one thousand, nine hundred eighty-five".